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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Total [1] $ 89,528 $ 102,294
Products and services transferred over time    
Disaggregation of Revenue [Line Items]    
Total 71,917 76,461
Products and services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Total 17,611 25,833
Ratings and Planning    
Disaggregation of Revenue [Line Items]    
Total 63,521 70,577
Analytics and Optimization    
Disaggregation of Revenue [Line Items]    
Total 15,501 21,458
Movies Reporting and Analytics    
Disaggregation of Revenue [Line Items]    
Total 10,506 10,259
Reportable Geographical Components | United States    
Disaggregation of Revenue [Line Items]    
Total 77,146 87,976
Reportable Geographical Components | Europe    
Disaggregation of Revenue [Line Items]    
Total 7,483 8,412
Reportable Geographical Components | Latin America    
Disaggregation of Revenue [Line Items]    
Total 2,020 2,402
Reportable Geographical Components | Canada    
Disaggregation of Revenue [Line Items]    
Total 1,562 1,840
Reportable Geographical Components | Other    
Disaggregation of Revenue [Line Items]    
Total $ 1,317 $ 1,664
[1] 1) Transactions with related parties are included in the line items above (refer to Footnote 8, Related Party Transactions, of the Notes to Condensed Consolidated Financial Statements for additional information).